u_led.lst

在keil平台上面用汇编语言编写的世界上最简单的51PWM控制小灯程序 编译后代码只有30字节 可以用于测试单片机的最小程序

A51 MACRO ASSEMBLER  U_LED                                                                12/01/2006 15:27:36 PAGE     1


MACRO ASSEMBLER A51 V7.10
OBJECT MODULE PLACED IN u_led.OBJ
ASSEMBLER INVOKED BY: C:\Program Files\Keil\C51\BIN\A51.EXE u_led.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

0000                   1             ORG     00H
0000 7F01              2     START:  MOV     R7,#01
0002 7A14              3     D4:     MOV     R2,#20
0004 7D14              4             MOV     R5,#20
0006 7A14              5     D3:     MOV     R2,#20
0008 7BFA              6     LOOP:   MOV     R3,#250
000A D290              7     D1:     SETB    P1.0
000C DBFC              8             DJNZ    R3,D1
000E EF                9             MOV     A,R7
000F FE               10             MOV     R6,A
0010 C290             11     D2:     CLR     P1.0
0012 DEFC             12             DJNZ    R6,D2
0014 DAF2             13             DJNZ    R2,LOOP
0016 DDEE             14             DJNZ    R5,D3
0018 0F               15             INC     R7
0019 BFFAE6           16             CJNE    R7,#250,D4
001C 80E2             17             JMP     START
                      18             END
                             
A51 MACRO ASSEMBLER  U_LED                                                                12/01/2006 15:27:36 PAGE     2

SYMBOL TABLE LISTING
------ ----- -------


N A M E             T Y P E  V A L U E   ATTRIBUTES

D1 . . . . . . . .  C ADDR   000AH   A   
D2 . . . . . . . .  C ADDR   0010H   A   
D3 . . . . . . . .  C ADDR   0006H   A   
D4 . . . . . . . .  C ADDR   0002H   A   
LOOP . . . . . . .  C ADDR   0008H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
START. . . . . . .  C ADDR   0000H   A   


REGISTER BANK(S) USED: 0 


ASSEMBLY COMPLETE.  0 WARNING(S), 0 ERROR(S)